Dynamo-electric machine.



E. F. COLLINS.

DYNAMO ELECTRIC MACHINE. APPLICATION FILED JAN-.27, 1914.

1,144,351. Patented-June 29,1915.

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r MAR F. COLLINS, OF

r" NEGTY, NEW YORK, ASSIGNOR T0 GENERAL ELECTRIC ANY, A. 00 TION' OF NEW YORK.

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To all whom it may concern V This present application is a division of my prior application for electric Welding, Serial No. 74:9,360,fi1ed.Feb; 19, 1913.

For a fuller understanding of my invention reference may be had to the accompanying drawings, in which Figure 1 is a vertical section of a part of a rotor of an induction motor in which I have shown my invention embodied Fig. 2'

is a detail view showing the method of i sembling certain parts of the rotor of Fig. 1, and Fig. 3 is a modification. v

In the drawings, 1 is a shaft on which the armature of an induction motor, in which i have shown my invention embodied, is mounted. A spider 2 is secured on the shaft 1 and provided with a peripheral flange 3, on which is mounted the usual laminations 4.. These laminations are secured in position by means of end clamping plates 5 and bolts 6.. The conductor bars 7 are mounted in slots in the laminations l in the usual manner and are engaged at their ends by a shortcircuiting ring in accordance with myv tor bar. My invention, therefore, provides a construction in which the ring is indirectly secured to the conductor bar, which consists in securing a third member both to the end ring and tothe end.of the conductor bar. An effective method. of securing this third member to the end ring andthe conductor i Specification team-rams.

v extending projections,

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Patented June 29, 1915.

1913, Serial No. 749,360. Divided and this application filed January 27, 1914. Serial N0. 814,628.

7 bar, is by Welding the same to both the ring and the bars. In case this method is used, the radiation and conduction of heat from the end ring to the region of the contact surface between the end ring and the conductor bars is largely confined by providing radial slots 10 in the end ring, which extend inwardly from the outersurface of the end ring. These slots 10 in the end rin form which are preferably of the same area as the ends of the conductor bars; This effectively segregates the metal of the end ring which is to be welded to the metallic member 9, and prevents a prohibitive radiation and conduction of heat, at the same time maintaining the contacting sur face of the end ring at substantially the same temperature as that existing at the contact surface of the conductor bar.

,lnorder to carry out my process of welding as covered by my other applicatioii above referred to, the conductor bar is placed in position on the end ring between two adjacent slots so that the end of the'conductor bar rests immediately over the projection formed on the end ring between the two slots, and the end surface of the end ring and the end of the conductor bar are substantially in the same plane. The metallic both the end of the conductor bar and the projection on the end ring, the conductor bar and the end ring constituting one electrode and the'metallic clip the other electrode, and, by passing a suitable'amount of current between the two electrodes and applying suitable pressure between the metallie member, and the conductor bar and end ring respectively, in a manner well under stood in the art, the metallic member is efiiectually welded to the end ring and the conductor bar, and effectively secures the latter two together, and the end ring is thus made substantially integral with the conducting In Fig. 3 T have shown a modification of metallic member 9 is applied in the same manner asis the clip in F ig. 2.

I desire it to be understood that my invention is not limited to the particular construe-V tion shown and described and may be applied to the short-circuited windings of synchronous motors, rotary converters and the like, and I aim in the ap ended claims to cover all modifications which do not depart y from thespirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. In a dynamo electric machine, a short- ;circuited winding comprising conductor bars, an end ring having its end surface in substantially the same plane as the ends of the conductor bars, and metallic members integrally secured to the end ring and the conductor bars, the end rmgbeing provided with radial slots extending inwardly from v the end surface and located between the-coneach of said projections having substantially I the same area as each of the ends of the conductor bars, and metallic members integrally secured to the ends of the conductor bars and to the end ring.

-3. In a dynamo I circuited winding comprising conductor bars, anend ring provided with lateral projections, each of said projections having substantially the same area as each of the ends of the conductor bars, and metallic members integrally secured to the ends of the conductor bars andto the end ring, said memlectric machine, a shortbers extending a substantially radial direction.

In witness whereof, I have hereuntoset my hand this 26th day of January, 1914.

EDGAR F. COLLINS.

Witnesses: RoB'r. EDWARD WAGNER, HELEN Onrom). 

